XPRMgetattr
XPRMgetattr |
Purpose
Get an attribute of an entity.
Synopsis
int XPRMgetattr(XPRMmodel model, XPRMattrdesc attrdesc, void *ref, XPRMalltypes *value);
Arguments
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model
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Reference to a model
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attrdesc
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An attribute descriptor
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ref
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An entity of the type associated to the attribute
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value
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Pointer to an area where the value of the attribute is returned
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Return value
Type number of the returned value or
0 in case of error.
Example
The following example displays the reduced cost of variable
x.
XPRMalltypes x,rcost;
XPRMattrdesc getrcost;
XPRMfindident(model,"x",&x);
getrcost=XPRMfindattrdesc(model,XPRM_TYP_MPVAR,"rcost");
XPRMgetattr(model,getrcost,x.ref,&rcost);
printf("getrcost(x)=%g\n",rcost.real);
Further information
1. This function makes it possible to retrieve an attribute of an entity using a type descriptor as returned by
XPRMfindattrdesc.
2. The internal list of types attributes is deleted each time the model is run or reset: descriptors obtained before a model execution should not be used after the model has been run.
Related topics